first to tell you that fbi investigators have not set foot in the ruins of the american consulate of benghazi, libya. tonight, we're the first it tell you why. the likely reason and from a top law enforcement official. four americans as you know were murdered in the assault, one american ambassador, christopher stevens, that was 2 1/2 weeks ago, 2 1/2 weeks, that saw the administration describe this first as a spontan